[libvirt] [PATCH 2/7] qemu: Properly update completed migration stats

[Jiri Denemark]

We should not overwrite all migration statistics on the source with the
numbers sent by the destination since the source may have an updated
view in some cases (such as post-copy migration). It's safer to update
just the timing info we need to get from the destination and be prepared
for the future. And we should only do all this after a successful
migration.

Signed-off-by: Jiri Denemark <jdenemar at redhat.com>
---
 src/qemu/qemu_migration.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 97e98bb..e6895df 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3867,6 +3867,8 @@ qemuMigrationConfirmPhase(virQEMUDriverPtr driver,
     virObjectEventPtr event = NULL;
     int rv = -1;
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    qemuDomainJobInfoPtr jobInfo = NULL;
 
     VIR_DEBUG("driver=%p, conn=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
               "flags=%x, retcode=%d",
@@ -3884,12 +3886,18 @@ qemuMigrationConfirmPhase(virQEMUDriverPtr driver,
                                        QEMU_MIGRATION_COOKIE_STATS)))
         goto cleanup;
 
-    /* Update total times with the values sent by the destination daemon */
-    if (mig->jobInfo) {
-        qemuDomainObjPrivatePtr priv = vm->privateData;
+    /* Update times with the values sent by the destination daemon */
+    if (retcode == 0)
+        jobInfo = priv->job.completed;
+    else
         VIR_FREE(priv->job.completed);
-        priv->job.completed = mig->jobInfo;
-        mig->jobInfo = NULL;
+    if (mig->jobInfo && jobInfo) {
+        jobInfo->type = mig->jobInfo->type;
+        qemuDomainJobInfoUpdateTime(jobInfo);
+        jobInfo->timeDeltaSet = mig->jobInfo->timeDeltaSet;
+        jobInfo->timeDelta = mig->jobInfo->timeDelta;
+        jobInfo->stats.downtime_set = mig->jobInfo->stats.downtime_set;
+        jobInfo->stats.downtime = mig->jobInfo->stats.downtime;
     }
 
     if (flags & VIR_MIGRATE_OFFLINE)
-- 
2.7.2